Purobot Ultra Litter Pad 3.0 vs Max 3.0: Which Pad Fits?
By PETKIT | Auto Litter Box, Smart Feeder, Water Fountain | Published: 2026-10-14
Category: 比較
The Ultra 3.0 pad is built only for the Purobot Ultra; the Max 3.0 pad is the general-fit option. Here is how to pick the right replacement without guessing.
Quick Answer
If you own a Purobot Ultra, buy the High Performance Cat Litter Pad Ultra 3.0; it is the only pad in this pair designed specifically for that model. Choose the High Performance Cat Litter Pad Max 3.0 when you need the general-fit version for other compatible automatic litter boxes. Both share the same anti-stick, waterproof, scratch-resistant build, so the deciding factor is fit, not fabric.
Why the Pad Model Matters More Than the Fabric
Both pads use high-density 300D Oxford cloth with a waterproof coating, so neither one wins on material alone. The real difference is the shape and how it mates with the cylinder inside your litter box. The Ultra 3.0 is cut to work with the Purobot Ultra's cylinder to create a 360-degree leak-proof seal. The Max 3.0 is the broader-fit pad that pairs with the upgraded cylinder to stop urine from reaching the bottom of the box. If you install the wrong pad, you lose that seal even though the cloth itself is identical. That is why 'which pad fits' is a compatibility question first and a durability question second.
How to Confirm Your Pad Before You Order
Check the model name printed on your litter box or in its app, not the pad you are replacing. Pads can be swapped between owners or bought secondhand, so the old pad is not reliable evidence. If your box is a Purobot Ultra, order the Ultra 3.0. If it is another compatible automatic box, order the Max 3.0. When the model is unclear, measure the pad you have and compare it with the product page dimensions before checkout. Also check the pad's condition: once the waterproof layer is scratched through, liquid can reach the bottom of the box, and no amount of cleaning will restore the barrier.
Replacement Rhythm and Cleanup
The anti-stick surface means waste does not cling, so routine cleanup is a wipe rather than a scrub. That said, the pad is a wear item. Inspect it every time you empty the waste drawer and replace it when you see scratches that cut through the coating, persistent odor after cleaning, or curling edges that no longer sit flat against the cylinder. Keeping a spare on hand matters more in multi-cat homes, where the pad is exposed to more traffic and more frequent cleaning. Pair your pad order with the correct Cat Litter Sifter for your litter type so the whole cleaning path stays consistent.
Trade-Offs at a Glance
- Model-specific fit vs. broader compatibility: The Ultra 3.0 is tailored to the Purobot Ultra cylinder for a 360-degree seal. The Max 3.0 is the general-fit pad that works with the upgraded cylinder on compatible boxes. Buy for your box model, not for the pad you happen to be replacing.
- Same surface, different consequences: Both pads are anti-stick, waterproof, and scratch-resistant, so daily cleanup feels similar. The difference shows up only when the seal is wrong: liquid reaches the bottom of the box and cleanup becomes a deep-clean job. A cheaper pad that does not seal is not a saving.
- Spare-pad stocking: Keeping one spare is sensible in multi-cat homes, but buying the wrong spare wastes the purchase. Confirm the model first, then stock. Verify the model name, then order one spare.
Pad and Litter Box Facts
- High Performance Cat Litter Pad Ultra 3.0 (Only for Purobot Ultra): Made of high-density 300D Oxford cloth with waterproof coating, the Ultra 3.0 pad is anti-stick, scratch-resistant, and easy to clean. The pad and cylinder work together to achieve a 360-degree leak-proof litter box. This is the model-specific pad. If you own a Purobot Ultra, this is the one that preserves the intended leak protection.
- High Performance Cat Litter Pad Max 3.0: The Max 3.0 pad collaborates with the upgraded cylinder to prevent urine leakage within the automatic cat litter box. Its waterproof surface prevents liquid from seeping through to the bottom, and the anti-stick feature keeps waste from adhering to the surface. This is the general-fit option. Choose it when your automatic litter box is not a Purobot Ultra but is compatible with the Max 3.0.
- Cat Litter Sifter (Only for Purobot Ultra): The litter sifter separates clumps from clean litter to maintain cleanliness and maximize litter utilization. The standard sifter suits tofu cat litter, while the honeycomb sifter suits clay cat litter. Sifter choice depends on your litter, not your pad. Matching both to your setup keeps clumps from smearing the pad surface.
Which Pad Should You Order?
Best for
- Purobot Ultra owners who want the model-specific pad and the intended 360-degree leak protection
- Households replacing a worn Ultra 3.0 pad and wanting an exact fit
Not for
- Owners of other automatic litter boxes that need the general-fit Max 3.0 pad
- Anyone who has not confirmed their litter box model name
